Sensor connections 1997 BMW 528i

[Mama Duck]

We replaced the head gasket on the above car and are in the process of putting the intake side of the engine back together. However, we have come to a point where we have 2 extra sensor lines on a line that has a 3 wire harness and we are unable to locate a male plug that goes to a sensor at the end of the fuel rail. We have been looking at pics from this website and noted that there are 2 square 2 pin male sensors that are positioned beside the water line under the intake manifold on the the head, but we have only 1 4 pin round sensor and a terminating bolt in these 2 holes. Could this 4pin have replaced the other 2 sensors and therefore the female ends on the wire harness are just extra now?

The other female sensor is located at the end of the fuel rail next to the VANOS system. Can anyone tell me where the sensor that would plug into this would be located?

Any help would be appreciated.